.cd-top {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    /* image replacement properties */
    overflow: hidden;
    border-radius: 50%;
    border: 3px solid lightgreen;
    text-indent: 100%;
    white-space: nowrap;
    background: rgb(12, 142, 85) url(cd-top-arrow.svg) no-repeat center 50%;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s;
    -moz-transition: opacity .3s 0s, visibility 0s .3s;
    transition: opacity .3s 0s, visibility 0s .3s;
}

    .cd-top.cd-is-visible, .cd-top.cd-fade-out, .no-touch .cd-top:hover {
        -webkit-transition: opacity .3s 0s, visibility 0s 0s;
        -moz-transition: opacity .3s 0s, visibility 0s 0s;
        transition: opacity .3s 0s, visibility 0s 0s;
    }

    .cd-top.cd-is-visible {
        /* the button becomes visible */
        visibility: visible;
        opacity: 1;
    }

    .cd-top.cd-fade-out {
        /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
        opacity: 1;
    }

.no-touch .cd-top:hover {
    background-color: #e86256;
    opacity: 1;
}

@media only screen and (min-width: 768px) {
    .cd-top {
        right: 20px;
        bottom: 20px;
    }
}

@media only screen and (min-width: 1024px) {
    .cd-top {
        right: 30px;
        bottom: 50px;
    }
}
